Grinding-tool.



GRINmMG TOOL.v

APP'L-,ICATION FILED JUNE 17.4918..

Patente-d Jan. 14, 1919.

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. 4 H Tf T LT A .,w.. k M MIIHITIHIRHIIII IIIPUHNIUHN/JIIDHINHUWIILW# y UNITED STATES .PATENT of the invention. Y

Fig. 2 shows the mechanism-for effectingcation.

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Aemrmlrisr'1i-T o m.. 1, ,897. sipecication of I lettersA Patent. Patented J 811-. 14, 1919.

Application ma :une 17,'191s. serum. 240,445. To all zclzom ztmzy concern."v I thereof isa ball race 1 2, and on the reduced Be it known that I, WnmAM LnRoY BRY- ANT, a citizen of the VUnited States, residing at Springfield, in the countyof Windsor and State of Vermont, have inventedl Improvements in Grindingnew and useful Tools, of which the following is a speci This invention has relation to machines and has for' itsobjectjto provide certain improvements by which the grind'- ing wheel and its spindle may be insured 'I against lateral Ivibration, and chatter prevented. In accord-v marks on'the'work ance with the present invention, provision is made for effecting an automatic adjustment of the bearing for-the spindle, to com-` pensate for wear, least looseness in he lit ofthe parts, such as would @permit an improper yielding-or vibration of the grinding wheel.

On the accompanying'drawing, Figure 1 represents a vlongitudinal section through a grinding spindle and the associated parts, and illustrates one 'embodiment theV automatic adjustment of the bearing.`

Fig. 3 represents a sectionon the line 3-3 of Fig. 1. Y

The instrumentalities illustrated upon the accompanying drawing may be employed in a grinding machine of the type of that i111 s: trated in my Letters Patent No. 1,051,483, dated January 28, 1913, to which reference may be had, the present invention relating particularly to the grinding wheel spindle and the parts associated therewith. The spindle 5 has on its reduced'and tapered ont end a polishing, abrading or grinding wheel 6 of the requisite diameter and shape, which is held in place by a screw 7, a washer 8, and bushing 9, of any suitable or usual construction. The spindle is located, for the most part, within a tubular body 10, supported by an arm 11 capable otmovement laterally of the axis of said spindle, as described in the Letters Patent aforesaid. Within the tubular body and at the rear end thrust bearing comprises the races 16 'hub of a disk 23 which thereby preventing the the nut has a Harige rearend 13 of-the spmdle is a second' race 14, there being balls 15 between the races..

also a lateral thrust bearing. The endand 17 and the balls 18; and the lateral thrust armg comprises the races 19 and 20 and the balls 21; 'the races 16 and 20 being properly beveled and ground'to perform theirl allottedflmctions. The races 17 and clamped against a shoulder 22 spindle by the inwardly projecting is screwed upon a on the threaded portion 24 of 25 between said races as shown. The two are located in an enlargement of the bore of the body-.10, the rce16 abutting against an internal shoulder 26. l

.The race 20, which dares rearwardly, is automatically adjusted rearwardly to com pensate for wear on the bearing and to prevent any lateral movement of the spindle. -For this purpose I employ a 'spring-tensionednut which engages said race, and which is rotated yieldingly by its spring as theA wear occurs. The nut is indicated at 27, and it has an internal square thread 28 so that it may be screwed upon the complementally threaded portion 29 of the body O as shown in Fig.,1. At its -ront llend which engages the outer end of the race 20. A -sleeve-3l encircles the nut, and its inner or rear end lits upon the body 10 and is aixed thereto 'by a set screw 311. A helical spring 32 is located in a' space between the rear end of the nut and the inner end of the sleeve, one end 33 being bent and inserted in a socket 34 in the nut, and theother end 35 being bent and inserted in a socket 36 in the end ofthe sleeve. The stored power in the spring tends to rotate the nut in a direction to force it rearwardly of the body and hence crowd the race 20 to the right. The presf the spindle, there being a spacer or' washer races 16 and 20 sleeve 31 and the front end exterior oftheV latter being slightly reduced sure of the spring may be varied by rotatively adjusting the sleeve on the body and securing it in the proper position.

ln order that dust and grit may be prevented from gaining access to the bearings, the disk 23 has a tubular flange 37 which fits in a recess between the front end of the of the nut 27, the

for this purpose. A gasket 33 of suitable cushioning or yielding material, held in `an internal groove in the flange 30 of the nut 27, encircles and engages the hub of the disk 23. As a result of this construction, it is evidentthat the anti-friction bearings are amply protected. from the entrance of foreign particles. A

As a matter of construction, the tubular body l0 has `an aperture 40, for lubricant, normally closed by a screiv plug 41.

It Will be understood that the spindle 5 may be rotated by any convenient mecha` nism. Asshoivn, a pulley 42, driven in any suitable Way, is keyed upon a spindle 43 journaled in anti-friction bearings indicated as a Whole respectivelyv at 44T, 45. The pulley spindle 43 and the tool spindle 5 are substantially in alinement and are connected by a lioating coupling 46 engaged with coupling members 47, 48, screwed upon the confronting ends of said spindles. Any other mechanisinfmay be employed for rotating the tool carrier, although that shown is desirable,l as it elects the vrotation ofthe spindle without subjecting vit to the lateral thrust of a driving pulley, such thrust being Withstood and resisted by the' anti-friction bearings Ll, 45. v

Referring once more to the front end of the tool or grinding spindle and the associated parts, it ivill be observed that they maybe easily assembled.v The spindle is introduced through the rear end of ,the body Y, 10. The anti-friction bearings are inserted the races y17 and i9 in place; the sleeve 31 is slipped on the body; the nut is screwed into place; and then, by a spanner or other suitable tool, the disk 23 is screwed on the spindle to clamp rigidly against the shoulder 22. The sleeve 3l is now rotativelyl adjusted to cause the storage of poiver in the spring, and is then secured upon the body 10 by the set screvv 311. A grinding ivheel of the desired shape and size is secured on the projecting end of the spindle, to be replaced by others as 4circumstances require. ln operation, the disk rotates rapidly with the spindle, and itand the non-rotary sleeve forni an inclosin g casing for the automatic nut and the antiriction bearings. Having thus explained the nature c said invent' and described a Way of ing and usii the saine, although vf attempting to set orth all oi the in nagaan? i which it may be made or all of the modes ot'its use, what I claim is:

l. ln combination, a spindle, a relatively stationary body or support, a bearing for saidV spindle supported by said` body, a rotatable longitudinally movable member supported by said body for adjusting said bearing to compensate for wear, and means for automatically rotating said member.

2. ln combination, a spindle, a relatively stationary body or support, a bearing for said spindle supported by said body, a nut in threaded engagement With said body and exerting a longitudinal thrust against said bearing, .and a spring for automatically rotating said nut.

3. In combination, a spindle, a relatively stationary body or support, a bearing for said spindle supported by said body coxnprising -races supported by said body and said spindle respectively, .and intervening balls, and automatic means for automatically adjusting oiie of Said races in relation to the other to compensate for Wear and pre-,Jy

vent lateral movement oi' said spindle.

-l. In combination, a spindle', an external tubular support therefor, anl anti-friction bearing in said support for said spindle, including an axially movable race, spring-impelled nut on said support engaging said race. i

5. Incombination, a. spindle, tubular support therefor, an anti-friction bearing iii said support for said spindle, including anl axially movable race, threaded on said body and engaging said and a an external race, a member affixed upon said body, and' aspring having itsends attached to, said member and said nutand capable by stored power ,of rotating saidnut to effect an axial adjustment of said race. i

6. ln combination, a spindle, an external y tubular support therefor, abearing in ,said support for said spindle including a beveled member, a nut lthreaded fon. said body and adjust said member axially, and

adapted to a spring connected at' one end toi said nut to said body, for auto--w and at its other end matically ,rotating4 said nut' thereby eiecting an axial adjustment of said bearing member.

7. 'ln combination, a spindle, an external ,ini

tubular support therefor having an external y screw thread, a complementally threaded nut thereon, a rotatively adjustable member secured on said body, a. spring securedto said nut and member' and tending to rotate said nut, and a ball bearing for the spindle 3, in combination, a rotary spindle, an

'and located Within said tubular body, said enrircling tubular body or support therefor,

a bearing for the spindle located in the support and comprising a. member axially Landen?` .l 'f3 j ustable to compensate for wear, and springoperated mechanism, encircling the body,

for automatically adjusting said bearing member. 4

9. In combination,a grindin spindle, a grinding Wheel thereon, a tubu ar body or sufnfort, ball bearings in said body in vvhichsai spindle is journaled, one of said bearings comprising an axially movable race, a

nut threaded .on said body ,andenga `ng 10- said race, al sleeve xed on said body an in closingl said nut, aspringconnected to said sleeve and-to said nut to rotate the latter, and a disk on 'the spindle having-a-flange in telescoping relation with. said .s1'eeve. 15

In testimony whereof I` have ailixed my signature. f, i WILLIAM LE ROY BRYANT. 

